1 files changed, 82 insertions, 0 deletions
diff --git a/src/libunixonacid/unixmessage_sender_flush.c b/src/libunixonacid/unixmessage_sender_flush.c
new file mode 100644
index 0000000..ab8d460
--- /dev/null
+++ b/src/libunixonacid/unixmessage_sender_flush.c
@@ -0,0 +1,82 @@
+/* ISC license. */
+
+#define _XPG4_2
+#include <skalibs/sysdeps.h>
+#include <skalibs/nonposix.h>
+#include <sys/socket.h>
+#include <sys/uio.h>
+#include <unistd.h>
+#include <skalibs/uint.h>
+#include <skalibs/diuint.h>
+#include <skalibs/stralloc.h>
+#include <skalibs/genalloc.h>
+#include <skalibs/djbunix.h>
+#include <skalibs/unixmessage.h>
+
+ /* MacOS X tries hard to be POSIX-compliant... and fails. */
+#ifndef MSG_NOSIGNAL
+#define MSG_NOSIGNAL 0
+#endif
+
+int unixmessage_sender_flush (unixmessage_sender_t *b)
+{
+  diuint last = { .left = b->data.len, .right = genalloc_len(int, &b->fds) } ;
+  diuint *offsets = genalloc_s(diuint, &b->offsets) ;
+  unsigned int n = genalloc_len(diuint, &b->offsets) ;
+  unsigned int oldhead = b->head ;
+  for (; b->head < n ; b->head++)
+  {
+    diuint *next = b->head+1 < n ? offsets + b->head+1 : &last ;
+    unsigned int len = next->left - offsets[b->head].left ;
+    unsigned int nfds = next->right - offsets[b->head].right ;
+    char pack[sizeof(unsigned int) << 1] ;
+    struct iovec v[2] =
+    {
+      { .iov_base = pack, .iov_len = sizeof(unsigned int) << 1 },
+      { .iov_base = b->data.s + offsets[b->head].left, .iov_len = len }
+    } ;
+    char ancilbuf[CMSG_SPACE(nfds * sizeof(int))] ;
+    struct msghdr hdr =
+    {
+      .msg_name = 0,
+      .msg_namelen = 0,
+      .msg_iov = v,
+      .msg_iovlen = 2,
+      .msg_control = nfds ? ancilbuf : 0,
+      .msg_controllen = nfds ? sizeof(ancilbuf) : 0
+    } ;
+    uint_pack_big(pack, len) ;
+    uint_pack_big(pack + sizeof(unsigned int), nfds) ;
+    if (nfds)
+    {
+      struct cmsghdr *cp = CMSG_FIRSTHDR(&hdr) ;
+      register unsigned int i = 0 ;
+      cp->cmsg_level = SOL_SOCKET ;
+      cp->cmsg_type = SCM_RIGHTS ;
+      cp->cmsg_len = CMSG_LEN(nfds * sizeof(int)) ;
+      for (; i < nfds ; i++)
+      {
+        register int fd = genalloc_s(int, &b->fds)[offsets[b->head].right + i] ;
+        ((int *)CMSG_DATA(cp))[i] = fd < 0 ? -(fd+1) : fd ;
+      }
+    }
+    if (sendmsg(b->fd, &hdr, MSG_NOSIGNAL) < len + (sizeof(unsigned int) << 1))
+      return -(int)(b->head-oldhead)-1 ;
+#ifndef SKALIBS_HASANCILAUTOCLOSE
+    if (nfds)
+    {
+      register unsigned int i = 0 ;
+      for (; i < nfds ; i++)
+      {
+        register int fd = genalloc_s(int, &b->fds)[offsets[b->head].right + i] ;
+        if (fd < 0) fd_close(-(fd+1)) ;
+      }
+    }
+#endif
+  }
+  b->data.len = 0 ;
+  genalloc_setlen(int, &b->fds, 0) ;
+  genalloc_setlen(diuint, &b->offsets, 0) ;
+  b->head = 0 ;
+  return (int)(n - oldhead) ;
+}